/*
 * Copyright (c) 2002-2009 Moxie Marlinspike
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
 * USA
 */

#ifndef __UTIL_H__
#define __UTIL_H__

#include <string>
#include <sstream>
#include <iostream>
#include <vector>
#include <list>

#include <boost/asio.hpp>

class UnresolvableCertificateException : public std::exception
{
public:
	virtual const char* what() const throw()
	{
		return "Could not resolve common name...";
	}
};

class Util
{

public:

	template <class T>
	static bool fromString(T& t,
	                       std::string& s,
	                       std::ios_base& (*f)(std::ios_base&))
	{
		trimString(s);
		std::istringstream iss(s);
		return !(iss >> f >> t).fail();
	}

	static void trimString( std::string& str)
	{
		size_t startpos = str.find_first_not_of(" \t\r\n");
		size_t endpos = str.find_last_not_of(" \t\r\n");

		if(( std::string::npos == startpos ) || ( std::string::npos == endpos))
			str = "";
		else
			str = str.substr( startpos, endpos-startpos+1 );
	}

	static void tokenizeString(std::string &str,
	                           std::string &delimiters,
	                           std::vector<std::string> &tokens)
	{
		std::string::size_type lastPos = str.find_first_not_of(delimiters, 0);
		std::string::size_type pos     = str.find_first_of(delimiters, lastPos);

		while (std::string::npos != pos || std::string::npos != lastPos)
		{
			tokens.push_back(str.substr(lastPos, pos - lastPos));
			lastPos = str.find_first_not_of(delimiters, pos);
			pos     = str.find_first_of(delimiters, lastPos);
		}

		if (lastPos != std::string::npos)
			tokens.push_back(str.substr(lastPos));

	}

	static void resolveName(std::string &name, std::list<boost::asio::ip::address> &results)
	{
		boost::asio::io_service io_service;
		boost::asio::ip::tcp::resolver resolver(io_service);
		boost::asio::ip::tcp::resolver::query query(name, "https");
		boost::asio::ip::tcp::resolver::iterator endpoint_iterator = resolver.resolve(query);
		boost::asio::ip::tcp::resolver::iterator end;

		while (endpoint_iterator != end)
		{
//       std::cout << "Resolved To: " << (*endpoint_iterator).endpoint().address().to_string() << std::endl;
			results.push_back((*endpoint_iterator++).endpoint().address());
		}

		if (results.empty()) throw UnresolvableCertificateException();
	}

};


#endif
